/*
 * @name Operator Precedence
 * @description If you don't explicitly state the order in which an
 * expression is evaluated, they are evaluated based on the operator 
 * precedence. For example, in the statement "4+2*8", the 2 will
 * first be multiplied by 8 and then the result will be added to 4.
 * This is because the "*" has a higher precedence than the "+". To avoid
 * ambiguity in reading the program, it is recommended that is statement
 * is written as "4+(2*8)". The order of evaluation can be controlled
 * through placement of parenthesis in the code. A table of operator
 * precedence follows below.
 */
// The highest precedence is at the top of the list and 
// the lowest is at the bottom.
// Multiplicative: * / %
// Additive: + -
// Relational: < > <= >=
// Equality: == !=
// Logical AND: &&
// Logical OR: ||
// Assignment: = += -= *= /= %=
function setup() {
  createCanvas(710, 400);
  background(51);
  noFill();
  stroke(51);

  stroke(204);
  for(var i=0; i< width-20; i+= 4) {
    // The 30 is added to 70 and then evaluated
    // if it is greater than the current value of "i"
    // For clarity, write as "if (i > (30 + 70)) {"
    if (i > 30 + 70) {
      line(i, 0, i, 50);
    }
  }

  stroke(255);
  // The 2 is multiplied by the 8 and the result is added to the 4
  // For clarity, write as "rect(5 + (2 * 8), 0, 90, 20);"
  rect(4 + 2 * 8, 52, 290, 48);
  rect((4 + 2) * 8, 100, 290, 49);

  stroke(153);
  for (var i = 0; i < width; i+= 2) {
    // The relational statements are evaluated 
    // first, and then the logical AND statements and 
    // finally the logical OR. For clarity, write as:
    // "if(((i > 20) && (i < 50)) || ((i > 100) && (i < width-20))) {"
    if (i > 20 && i < 50 || i > 100 && i < width-20) {
      line(i, 151, i, height-1);
    } 
  }

}